三聚氰胺甲醛树脂预聚阶段单体转化率的预测模型

A Prediction Model for Monomer Conversion in the Pre-synthesis Process of Melamine formaldehyde Resin

关键词:  甲醛  三聚氰胺甲醛树脂  单体转化率  动力学  预测  模型

Key Words:formaldehyde  melamine-formaldehyde resin  monomer conversion  kinetics  prediction  model

摘要:为有效监控三聚氰胺甲醛树脂预聚阶段中单体转化率的变化,本文考察了三聚氰胺甲醛树脂预聚阶段的反应时间（t）、反应温度(T)和n(三聚氰胺)∶n(甲醛)(r)对甲醛单体转化率的影响。研究发现，树脂预聚阶段中甲醛单体转化率与时间呈对数关系，与温度呈线性关系，与n(三聚氰胺)∶n(甲醛)呈二次函数关系;据此建立了甲醛单体转化率的预测模型,即：R=(0.125T-3.43)·(-27.2r2+22.0r-3.30)·ln(0.317t+1)。结果表明，该模型可有效描述反应过程中甲醛单体转化率的变化,与实际检测值之间有很好的相关性(R2=0.993)。因此,该模型可对三聚氰胺甲醛树脂的预聚过程进行很好的预测,进而为生产和控制提供指导。

Abstract:The aim of this study was to develop a predictive model to monitor the change of monomer conversion rate during the pre-synthesis process of melamine-formaldehyde resin. The effects of process parameters (reaction time, temperature and melamine/formaldehyde mole ratio) on the monomer conversion rate were investigated. The results showed that monomer conversion rate had an alogarithmical linear relationship with time, a linear relationship with temperature and a quadratic function relationship with the reciprocal of mole ratio of the monomers.Based on these relationships, an predictive model, R=(0.125T-3.43)×(-27.2r2+22.0r-3.30)×ln(0.317t+1), was developed to predict the monomer conversion rate of formaldehyde during the synthesis process. A good linear correlation (R²=0.993) between the predictive value and practical determination, indicated that the model had good accuracy and reliability for predicting the monomer conversion rate during the synthesis process. The developed model could provide a useful guideline for the production of melamine-formaldehyde resin.